Noel- I live in Minneapolis and recently got a new passport. I'm not sure about all locations but at least here you can do a "walk up" (no appointment) to get a new passport added to your current Global Entry. I waited about 20 minutes for an officer to do it. Also, your current Global Entry will be good for a year after its expiration date if you apply for it before it expires. (This information comes from numerous news sources but the CBP still has not updated its website, so who know the real story.) BTW, your Global Entry card by itself works as a "Real ID" and this is confirmed on the Homeland Security website. Good luck!